No

All of your instincts were telling you to reveal your presence now and put a stop to this. Instead, you were transfixed, watching as the head got closer and closer until it was pressed against the resisting anal ring. The bottom girl whimpered in fear as she felt it but made no move to get away as the pressure slowly increased. When the head finally entered both gasped, one in pleasure, the other in pain as she was stretched for what you assumed to be the first time. The top girl's hips moved forward slowly as she defiled the forbidden hole. The girl on the bottom was obviously doing her best to avoid crying out as her dominator leaned over her. You could just barely make out what she said.

"This is what happens bitch!" She whispered sharply. "When we fight tomorrow you're going to fucking throw it. You'll get in your own team's way and fuck it up for everyone." She thrust forward roughly drawing a pained cry. "Got it?"

"Y-yes!"

"Good. Now shut the fuck up." You watched as she grabbed the discarded panties of her victim and **** them into her mouth to muffle the cries as she began thrusting in earnest. The sound of her hips slapping together the only other sound. To you, it seemed impossibly loud but you knew that the building would be blocking it from the general area. You were **** to admire her stamina as she continued plundering her 'conquest' for what felt like half an hour, sweat glistening on both bodies at the exertion. You didn't really know when it happened but eventually, the pained noises shifted in tone, before becoming moans of pleasure as the panties fell out of her mouth. They were quickly returned but moments later her body tightened up as she orgasmed from the anal ****. Her cock twitching as it wasted its load onto the ground.

It didn't stop for another two minutes when the final thrust was made and you watched as her ass get filled. When her defiler finally pulled out the girl slumped to the floor her body, laying there as her hole gaped from the ****. You took that as your sign to leave. The right thing to do would have been to report this. There was no way you could do that however and not admit that you'd just stood and watched the whole thing. Lily would have something to ensure you told the entire truth. It wasn't worth the risk. Making it back to your bed was easy enough. Dealing with your own arousal after you got there, not so much.